Automatic dwell-control device for embossing presses



Sept. 6, 1927. 1,641,632

D. D. HUYETT AUTOMATIC DWELL CONTROL DEVICE FOR EMBOSSINOPRESSES FiledMay 21, 1925 2 Sheets-Sheet l 1,641,632 Sept. 6, 1 D. HUYETT AUTOMATICDWELL COZHROL DEVICE FOR EMBOSSING PRESSES Filed May 21. 1925 2Sheets-Sheet 2 Patented Sept. 6, 1927.

UNETEZE renterrare AUTOMATIC DWELL-CONTRGL DEVICE FOR EMBGSSINGApplication filedMay 21, 1925. Serial No. 31,985.

This invention relates to an automatic dwell control for. power pressesand more particularly for embossing presses and the like, where the timeduring which the pres- 6 sure is exerted. by the press. is ofimportance. :mc of the principal fields of usefulness of the presentinvention is in connection with the manufacture of artificial leathercloth, wherein the product is subjected to the action of an embossingpress which imparts to it. various grained effects in imitation ofleather. In this operation threefactors are of importance, viz:

1. The temperature of the-engraved embossina' plate. 1

2. The pressure exerted per square inch of embossing area, and

The time during which this pressure is exerted. I

Means are provided on the present well known types of power embossingpresses for varying; the first two of these factors within certaindesired limits, but the third remains fixed when the presses are allowedto run 6 continuously. I

Under the. present practice. if a longer dwell is desired for certain ofthe heavier qualities of leather cloth and deeper grains a re to beembossed. the operator must throw out the clutch of the press by handand stop the press on each impression. the desired number of seconds. Hemust keep the time of dwell the same for each impression. otherwise theproduct will not be uniform. This requires skill and initiative on theopera tors part and chances of spoilage are always present.

The device of the present invention is intended to eliminate thepersonal factor n the operation above described and to obviate thenecessity for a skilled operator by stopping the press automatically. onthe impression. for any desired number of seconds. between certainlimits. and automatically start it ayrain without the assistance of anoperator. The, device is so constructed as to assure a uniform productby keeping); the time of dwell the same for each impression.

In the accompanying drawings:

Fig. 1 is an elevation of a dwell control mechanism constructed inaccordance with the invention.

Fig. 2'is a sectional view of a piston valve hereinafter described.

at eeeica.gi

DAIi'IEL D. HUYETT, WILMINGTON. DELAWARE, ASSIGNOB, T0 ATLAS POW'DERFig. 3 is a view showing part the press, I

frame in vertical section with the controlv mechanism attached thereto,and

Fig. 4c is a perspective view, of a trip lever and link hereinafterdescribed.

Like numerals designate corresponding parts in all of the figures of thedrawings.

In the drawings-5, 6 and designate usual parts of an embossing pressframe. In car rylng-out the invention 1 provide a piston rod 8 having apin and slot connection 9 with the usual hand control lever 10 of thepress. The piston rod 8 carries a piston 11 that is movable in acylinder 12. Air pipes 13 and 14 lead from the opposite ends of thiscylinder to the opposite ends of a piston valve casing 15 in which apiston valve 16 is slidably mounted. An air supply pipe 17 conducts airto the casing 15 and by refer-V ring; to Fig. 2 it will be seen thatwhen the valve 16 is in its uppermost position. air will be supplied tothe right hand end of the cylinder 12 through pipe '13, at which timethe left hand. end of the cylinder will be exhausted through pipe 1 1and a port 18 of the valve. When the valve is moved downwardly. a port19 thereof is brought into alignment with pipe 14 and air is suppliedthrough pipe 17. port 19 and pipe14. to the left hand end of thecylinder 12, at which time the right hand end of the cylinder isexhausted through pipe 13 and a port 20 of valve 16. Thus the piston incylinder. 12 is actuated under the control of the valve 16 to move theclutch control lever 10 back and forth to alternately start and stop thepress. the interval between the starting" and the stopping of the pressbeing controllable. but remaining constant after the mechanism has beenset for-agiven dwell, ashereinafter set forth. Y

I preferably dispose a rubber or other elastic cushioning element 21 inthe path of movement of the clutch control lever 10. to actv as a stopfor said lever. said cushioning element being carried by anv suitablesupporting: bracket. such as is indicated at 22. A red 23 extendsupwardly from the valve 16 and its upper end. is pivotally connected at24 to a trip lever 25. A spring 26 encircles the rod 23. the upper endof said spring bearingagainst a bracket 27 of the press frame and thelower end of said spring bearing; upon a collar 28 that is carried bytherod 23.. Thus the spring tends to thrust;

. the periphery of said cam. The lever 25 is I Mr pivoted at 31 upon asupporting bracket 32 of the press frame 5. The lever 25 com prises anupwardly extending car 33 to which the upper end of a trip link 34 ispivoted at 35. The lower end of this trip link carries an antifrictionroller 36, which is adapted to ride upon the periphery of a frictiondisc 37 and which disc has a notch 38 formed in its periphery. A spring39 is connected at one end with an car 40 of the lever 25 and at itsother end with the link 34.

The drive for the friction disc 37 comprises a belt 41 tight and loosepulleys 42 and43 and a drive shaft 44 upon which the pulleys aremounted. The shaft 44 through a countershaft 45 drives an interposedchange speed gearing 46 of the well known conventional form such as iscommonly employed upon lathes. The countershaft 45 carries a pinion 47which meshes with a gear 48 having a friction face 49, which bearsagainst the inner side of friction disc 37, frictional engagementbetween the two being maintained by a tensioning spring and nutindicated at 50.

When the cam 29 thrusts the valve 16 to the position illustrated in Fig.2 air is admitted, as before stated, to the right hand end of thecylinder and the clutch lever 10 is thrown toward the left to stop thepress. At the same time the upward. movement of the rod 23 lifts thelever 25 and link 34 to move the roller 36 out of the notch 38 of thefriction disc, permitting said disc to start to rotate in company withthe gear 48. The roller 36 being then supported upon the periphery ofthe friction disc 37, the valve will be held in its elevated positionuntil said disc makes a complete revolution and the notch 38 again comesinto alignment with the roller 36. at which time the roller 36 will dropinto the notch and the rod 23 will be moved downwardly, assisted in thisaction by the spring 26. This will result in moving the valve to itslower position and will admit' air to the opposite ends of the cylinder'12, which will result in throwing the clutch lever 10 to the right,thereby setting the press in operation.

The purpose of providing the trip link 34 and spring 39 is to insurethat the roller 36 will move entirely out of the notch when the lever 25is thrust upwardly by the cam. It will be observed that the arrangementis such that the link 34 may have a slight swinging movement betweenstops 25 and 25 of the lever 25. Thus at the time that the roller 36drops into the notch 38, it will,

under the action of the spring 39, be lying against the rearmostshoulder25. The disc 37 will continue to rotate under its frictional engagementwith the gear 48, carrying roller 36 with it and placing the springunder tension until the link 34 abuts against the forward stop 25'. Thenwhen the lever 25 is again lifted by the action of the cam 29 and theroller 36 is moved out. of notch 38, the spring 39 will cause link 34 tosnap backagainst the rear stop 25 thereby carrying the roller entirelyclear of the notch 38 and bringing it over the periphery of the disc 37.This obviates the possibility of the roller 36 falling back into thenotch 38 after cam 29 leaves the roller 30, in cases where the disc 37is moving very slowly. V

A manually operable stop lever 52 is pivoted at 53 to a bracket 54 andembraces rod 23 just below collar 28. By engaging this lever over asupporting ing 55' on a bracket 56, the rod 23 may be maintained inelevated position to keep the press stopped aslong as may be desired.

It is to be understood that the use of this apparatus is not confined toleather cloth embossing presses but that it can be used to advantage onany and all kinds of power presses where the time of exerting thepressure is a consideration.

Furthermore it is to be understood that the invention is not limited tothe particular arrangement of parts herein shown and described but thatit includes within its perview whatever changes fairly come withineither the terms or the spirit of the appended claims.

Having described my invention, what I claim is:

1. The combination with the controlling element of a continuouslyoperating embossing press of the character employing heated embossingplates, of a movable timed element settabie to move at varying rates ofspeed and connections between said timed element and said controllingmember through which the press is stopped and started once for eachpredetermined degree of movement of the timed element wherey theduration of .the application of both heat and pressure are variablycontrolled in accordance with. the setting of the timed element.

2. The combination with the controlling member of a continuouslyoperating emboss ing press of the character employing heated embossingplates, of a movable timed ele ment settable to move at varying rates ofspeed and connections between the timed ele ment and the controllingmember for shifting the latter to stop and start the press for eachcycle of'operation of the timed element, whereby the duration of theapplication of both heat and pressure are variably coning press of thecharacter employing heated embossing plates, of pressure actuated meansfor shifting the same, a valve controlling said pressure actuated means,means for moving the valve in both directions for each cycle ofoperation of the press and a movable timed element preventing movementof the valve in one direction until said timed element has moved apredetermined degree.

4. A structure as recited in claim 3 wherein the valve actuating meanscomprises an element moving in unison with the press and acting to movesaid valve in one direction and a spring tending to resist movement ofsaid valve in the other direction.

5. The combination with the controlling member of a continuouslyoperating embossing press of the character employing heated embossingplates, of a power element for actuating the same and a controllingmechanism for said power element comprising a movable timed element forcontrolling said mechanism and settable means for vary ing the rate ofmovement of said timed ele -ment, whereby the duration of theapplication of both heat and pressure are variably controlled inaccordance with the s t ing of the timed element.

(i. The combinacion with the controlling member of a continuouslyoperating embossing press oi the character employing heated embossingplates, of a power element for actuating the sa 9.0, a controlling valve"for the power element, a 't'rictionally driven timed element settableto move at varying rates or" speed and connections between thefrictiouall driven timed element and the controlling valve fordetermining the movernent of the latter: in one direction. whereby thedur: ion of the application 01'? bothheat and pre e variably controlledin accorcance 1 the setting of the timed element.

7. The combination with an embossing )1'85 of the character empl yingheated embossing plates, of a pre controlling member and a pneumaticallyactuated member 0011- nected thereto, a valve for controlling pressurefluid to the pneun'iatically actuated member, an element movable U1synchronism with the press mechanism for shifting said valve in onedirection and a movable timed elen'ient for determining the time ot movement of the valve in the other direction.

8. The combination with an embossing pres" ot the character employingheated embori g plates. of a controlling element, and a fluid pressureactuated power means "for moving the same, a controlling means for thepower means operable to shift the power means in one direction whenpress for shifting said valve in one direction, means tending to movethe valve in the opposite direction and a movable timed element, theposition of which determines the time at which the last named means wi lbe free to act to shift said valve. 10. in combination with an embossingprei's of the character employing heated embossing plates, a changespeed gearing a movable timed element driven therethrough, a presscontrolling mechanism. and connectious between the press controllingmechanism and the timed element, the position of said timed elementdetermining the tin'ie ol? operat on of said connections, whereby thednration of the application of bothheat and pressure are variablycontrolled in accordance w th the s tting of the timed element.

l1. combination with. an embossing )l'CiIS oi the character emnlovinheated embosving plates, a change speed gearing, of.

a timed element driven therethrough, a press controlling member, apneumatic means for actuating said press controllingmember a controllingvalve for thepneumatic means, an element movable in synchronism with thepress for shifting said the re a controllin valve for controllin reoon'efluid to said )neumatic element a cam movable in synchronism with thepress for actuatun said valve in one direction a spring tending toactuate the valve in the opposite direction, a movable tnned element andconnections between the movable timed element and the valve fordetermining the timeo't movement of the valve under the influence of thespring.

13. A structure as recited in driven.

14:. A structure as reclted 1n 012mm 12 in .111, means movable insynchronism with claim 12 vwherein said timed element is frictlonallycombination with a change speed gearing and a friction drive between thechange speed gearing and the timed element.

15. The combination with the controlling member of a power press, of afluid pressure actuated means for shifting the same, a controllingvalve, a cam for moving said valve in one direction, a spring tending tomove said valve in the opposite direction, a timed friction disc havinga notched periphery and a trip mechanism movable with the valve andengaging the periphery of said disc, said valve being held in oneposition as long as said trip mechanism engages the periphery of thedisc and being permitted to move to another position when said tripregisters with the notch in the periphery of said disc.

16. The combination with the controlling member of a power press, of afluid pressure actuated means for shifting the same, a piston valve forcontrolling pressure fluid to said fluid pressure actuated means, a cammovable in unison with the press for moving the valve in one direction,a rod extending from said valve, a pivoted lever to which the upper endof said rod is pivoted, a swinging link pivoted upon said lever andspring actuated in one direction, a disc having a notched periphery, anelement carried by the swinging link adapted to ride upon the peripheryof said disc and to drop into said notch .when said notch registers withsaid element, a friction driving element engaging said disc and a.change speed gearing through which said friction driving element isdriven.

17. A structure as recited in claim 16 in combination with means forholding the valve against movement and to prevent the element of theswinging link from dropping into the notch of the disc to therebyprevent starting of the press. I

18. A structure as recited in claim 16 in combination with a manuallyoperable lever engaging said rod and movable to a position to preventmovement of the rod in one direction to thereby hold the valve againstmovementand to prevent the element of the swinging link from droppinginto the notch of the disc when said. notch aligns therewith.

19. The combination with an embossing press of the character employingheated embossing plates, of a set-table controlling mechanism operatedby and in unison with the press, said controlling mechanismautomatically starting and stopping said press, with an interveningperiod of dwell, the length of which is determined by the setting ofsaid controlling mechanism.

20. The combination with an embossing press of the character employingheated em bossing plates and having a controlling lever, the movement ofwhich in one direction starts the press and the movement of a bossingplates and having a controlling.

lever, the movement of which in one direction starts the press and themovement of which in the other direction stops said press; of a pressureactuated element connected to said lever for moving it back and forth, avalve controlling the actuating pressure fluid of said element, andmeans for controlling the movement of said valve comprising a movabletimed element, and suitable means for varying the rate of movement ofsaid timed element.

22. The combination with an embossing press of the character employingheated embossing plates and having a controlling lever, the movement ofwhich in one direction starts the press and the movement of which in theother direction stops said press; of a pressure actuated elementconnected to said lever for moving it back and forth, a valvecontrolling the actuating pressure fluid of said element, means operatedby the press for moving the valve in one direction, and a settable andvariable timed means for controlling the movement of the valve in theother. direction.

23. The combination with an embossing press of the character employingheated embossing plates and having a controlling lever, the movement ofwhich in one direction starts the press and the movement of which in theother direction stops said press; of a pneumatic cylinder and piston thelatter being connected to said lever, a valve for controlling pressurefluid to said cylinder, and a controlling mechanism for said valveincluding a settable element the setting of which determines the time ofmovement of said valve and thereby determines the length of time thatthe product being embossed will be under pressure and under the actionof the heat of the embossing plates.

In testimony whereof he affixes his signa ture.

